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TMUFC1603-P07 LEVEL 1
EFFECTIVITY 27-00-00 Page 15
May 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 291
ALL
SELF EXAMINATION
What happens when Slat/Flap configuration is 1+F
and the CAS reaches 210 knots?
A - Flaps retract automatically to 0 and the
new Slat/Flap configuration is 1.
B - Flaps extend automatically because the
speed is too high.
C - The alpha lock function is engaged
because the CAS is too high.
TMUFC1603 LEVEL 1
EFFECTIVITY 27-00-00 Page 16
May 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 292
ALL
27 - FLIGHT CONTROLS
27-00-00 SLATS/FLAPS CONTROL
CONTENTS:
Extension Sequence
Self Examination
TMUFCTG01 LEVEL 3
EFFECTIVITY 27-00-00 Page 1
Mar 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 293
ALL
SLATS/FLAPS CONTROL
EXTENSION SEQUENCE
This presentation shows detailed operation of the Power
Control Unit (PCU) and the Slat Flap Control Computer
(SFCC), through a normal extension sequence.
As slat and flap control is identical, only the flap
system is shown.
Each valve block includes three solenoid valves. Two
of them, called directional valves, command the control
valve spool for retraction (RET) or extension (EXT),
while the enable solenoid valve (ENB) controls the
Pressure Off Brake (POB).
Moving the slat flap lever rotates the Command Sensor
Unit (CSU) which issues a new position demand signal
to each Slat Flap Control Computer (SFCC).
This signal is processed in flap lanes 1 and 2.
The position demand and the actual position from the
Feedback Position Pick off Unit (FPPU) are compared
in the SFCC flap lanes.
If the demanded and actual positions are different,
each lane generates command signals.
The command signals generated by each lane are
compared.
If the command signals are in agreement, drive commands
are generated for PCU valve block activation.
Each SFCC controls its related solenoid valve.
TMUFCTG01-T01 LEVEL 3
EFFECTIVITY 27-00-00 Page 2
Mar 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 294
ALL
TMUFCTG01-P01 LEVEL 3
SLATS/FLAPS CONTROL - EXTENSION SEQUENCE
EFFECTIVITY 27-00-00 Page 3
Mar 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 295
ALL
SLATS/FLAPS CONTROL
EXTENSION SEQUENCE
As the extend solenoid is energized, the control valve
spool moves from neutral towards the fully deflected
position.
The direction of valve spool movements controls the
direction of rotation of the motor.
The degree of valve spool movement controls the
rotation speed of the motor.
The position of the control valve spool is monitored
by a Linear Variable Differential Transducer (LVDT)
mounted on one end of the valve block.
The enable solenoid valve is energized to release the
Pressure Off Brake (POB), and the flaps begin to
extend.
With the control valve spool fully deflected, the
maximum available fluid flow is directed to the motors
which run at full speed for flap extension.
As the flaps approach the demanded position, the
retract solenoid is energized permitting the control
valve spool to move back to neutral position.
The control valve spool movement reduces the fluid
flow which in turn reduces the motor speed.
TMUFCTG01-T02 LEVEL 3
EFFECTIVITY 27-00-00 Page 4
Mar 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 296
ALL
TMUFCTG01-P02 LEVEL 3
SLATS/FLAPS CONTROL - EXTENSION SEQUENCE
EFFECTIVITY 27-00-00 Page 5
Mar 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 297
ALL
SLATS/FLAPS CONTROL
EXTENSION SEQUENCE
When the flaps reach the demanded position, all
solenoid valves are de-energized and the Pressure Off
Brake is applied.
The motor stops and the Pressure Off Brake (POB) is
applied to lock the flaps until a new position is
demanded.
　
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